package com.ydev.workouthelper.gui;

import java.util.HashMap;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.view.WindowManager;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;

import com.ydev.workouthelper.R;

public class MainActivity  extends FragmentActivity implements TabHost.OnTabChangeListener {

	 private TabHost mTabHost;
	    private HashMap mapTabInfo = new HashMap();
	    private TabInfo mLastTab = null;
	 
	    private class TabInfo {
	         private String tag;
	         private Class clss;
	         private Bundle args;
	         private Fragment fragment;
	         TabInfo(String tag, Class clazz, Bundle args) {
	             this.tag = tag;
	             this.clss = clazz;
	             this.args = args;
	         }
	 
	    }
	 
	    class TabFactory implements TabContentFactory {
	 
	        private final Context mContext;
	 
	        /**
	         * @param context
	         */
	        public TabFactory(Context context) {
	            mContext = context;
	        }
	 
	        /** (non-Javadoc)
	         * @see android.widget.TabHost.TabContentFactory#createTabContent(java.lang.String)
	         */
	        public View createTabContent(String tag) {
	            View v = new View(mContext);
	            v.setMinimumWidth(0);
	            v.setMinimumHeight(0);
	            return v;
	        }
	 
	    }
	    /** (non-Javadoc)
	     * @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle)
	     */
	    protected void onCreate(Bundle savedInstanceState) {
	        super.onCreate(savedInstanceState);
	        // Step 1: Inflate layout
	        setContentView(R.layout.activity_main);
	        this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

	        // Step 2: Setup TabHost
	        initialiseTabHost(savedInstanceState);
	        if (savedInstanceState != null) {
	            mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab")); //set the tab as per the saved state
	        }
	    }
	 
	    /** (non-Javadoc)
	     * @see android.support.v4.app.FragmentActivity#onSaveInstanceState(android.os.Bundle)
	     */
	    protected void onSaveInstanceState(Bundle outState) {
	        outState.putString("tab", mTabHost.getCurrentTabTag()); //save the tab selected
	        super.onSaveInstanceState(outState);
	    }
	 
	    /**
	     * Step 2: Setup TabHost
	     */
	    private void initialiseTabHost(Bundle args) {
	        mTabHost = (TabHost)findViewById(android.R.id.tabhost);
	        mTabHost.setup();
	        TabInfo tabInfo = null;
	        MainActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Logs").setIndicator("Logs"), ( tabInfo = new TabInfo("Logs", Logs.class, args)));
	        this.mapTabInfo.put(tabInfo.tag, tabInfo);
	        MainActivity.addTab(this, this.mTabHost, this.mTabHost.newTabSpec("Workout").setIndicator("Workout"), ( tabInfo = new TabInfo("Workout", Workout.class, args)));
	        this.mapTabInfo.put(tabInfo.tag, tabInfo);
	        // Default to first tab
	        this.onTabChanged("Logs");
	        //
	        mTabHost.setOnTabChangedListener(this);
	    }
	 
	    /**
	     * @param activity
	     * @param tabHost
	     * @param tabSpec
	     * @param clss
	     * @param args
	     */
	    private static void addTab(MainActivity activity, TabHost tabHost, TabHost.TabSpec tabSpec, TabInfo tabInfo) {
	        // Attach a Tab view factory to the spec
	        tabSpec.setContent(activity.new TabFactory(activity));
	        String tag = tabSpec.getTag();
	 
	        // Check to see if we already have a fragment for this tab, probably
	        // from a previously saved state.  If so, deactivate it, because our
	        // initial state is that a tab isn't shown.
	        tabInfo.fragment = activity.getSupportFragmentManager().findFragmentByTag(tag);
	        if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) {
	            FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction();
	            ft.detach(tabInfo.fragment);
	            ft.commit();
	            activity.getSupportFragmentManager().executePendingTransactions();
	        }
	 
	        tabHost.addTab(tabSpec);
	    }
	 
	    /** (non-Javadoc)
	     * @see android.widget.TabHost.OnTabChangeListener#onTabChanged(java.lang.String)
	     */
	    public void onTabChanged(String tag) {
	        TabInfo newTab = (TabInfo) this.mapTabInfo.get(tag);
	        if (mLastTab != newTab) {
	            FragmentTransaction ft = this.getSupportFragmentManager().beginTransaction();
	            if (mLastTab != null) {
	                if (mLastTab.fragment != null) {
	                    ft.detach(mLastTab.fragment);
	                }
	            }
	            if (newTab != null) {
	                if (newTab.fragment == null) {
	                    newTab.fragment = Fragment.instantiate(this,
	                            newTab.clss.getName(), newTab.args);
	                    ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag);
	                } else {
	                    ft.attach(newTab.fragment);
	                }
	            }
	 
	            mLastTab = newTab;
	            ft.commit();
	            this.getSupportFragmentManager().executePendingTransactions();
	        }
	    }
	 
	}
